// Protocol Buffers for GWT
// Copyright 2010 Thomas Broyer  All rights reserved.
// http://code.google.com/p/protobuf-gwt/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package net.ltgt.gwt.protobuf.compiler;

import com.google.protobuf.Descriptors.Descriptor;
import com.google.protobuf.compiler.JavaHelpers;

import net.ltgt.gwt.protobuf.compiler.client.Generator;

import java.io.IOException;
import java.io.Writer;

/**
 * @author t.broyer@ltgt.net Thomas Broyer
 * Based on the initial work of:
 * @author kenton@google.com Kenton Varda
 * Based on original Protocol Buffers design by
 * Sanjay Ghemawat, Jeff Dean, and others.
 */
public class CustomFieldSerializerGenerator extends Generator {

  private final Descriptor descriptor;
  
  public CustomFieldSerializerGenerator(Descriptor descriptor) {
    super(descriptor.getName() + "_CustomFieldSerializer");
    this.descriptor = descriptor;
  }

  public void generate(Writer output)
      throws IOException {
    boolean isOwnFile = descriptor.getContainingType() == null
        && descriptor.getFile().getOptions().getJavaMultipleFiles();
    String name = JavaHelpers.getClassName(descriptor);

    output.write("public ");
    if (!isOwnFile) {
      output.write("static ");
    }
    output.write("final class " + getName() + " {\n");
    // indent
    output.write("public static final void serialize(\n");
    output.write("    com.google.gwt.user.client.rpc.SerializationStreamWriter streamWriter,\n");
    output.write("    " + name + " instance)\n");
    output.write("    throws com.google.gwt.user.client.rpc.SerializationException {\n");
    output.write("  instance.writeTo(streamWriter);\n");
    output.write("}\n");
    output.write("\n");
    output.write("public static final " + name + " instantiate(\n");
    output.write("    com.google.gwt.user.client.rpc.SerializationStreamReader streamReader)\n");
    output.write("    throws com.google.gwt.user.client.rpc.SerializationException {\n");
    output.write("  return " + name + ".parseFrom(streamReader);\n");
    output.write("}\n");
    output.write("public static final void deserialize(\n");
    output.write("    com.google.gwt.user.client.rpc.SerializationStreamReader streamReader,\n");
    output.write("    " + name + " instance)\n");
    output.write("    throws com.google.gwt.user.client.rpc.SerializationException {\n");
    output.write("  // everything was done in instantiate() but this method is required.\n");
    output.write("}\n");
    // outdent
    output.write("}\n");
  }
}
